var k1 = 3;
var k2 = 0;
var a = k1=='1'?'color-success':k1=='0'?'color-red':k1=='3'?'color-kejin':''
console.log(a)

简单三元

scope.row.status = 1 ?'启用':'禁用'

精确三元表达

scope.row.status=1?'启用':scope.row.status=0?'禁用':''